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TCP GLOBAL SLOW START (SAME IP)

Publishing Venue

Motorola

Related People

Authors:

Rod Averbuch•Guy Romano

Abstract

TCP has several mechanisms to operate efficiently over a Wide Area Network. One mechanism is slow start. The TCP based on RFC2001 builds its transmit volume (window size) in an exponential way (1,2,4,8..).

Copyright

Motorola Inc. May 2000

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
50% of the total text.

MOTOROLA

Technical
Developments

TCP
GLOBAL SLOW START (SAME IP)

by Rod
Averbuch and Guy Romano

OVERVIEW

Patent
Disclosure #39ISH: TCP Global Slow Start (same IP)

TCP has
several mechanisms to operate efficiently over a Wide Area Network. One
mechanism is slow start. The TCP based on RFC2001 builds its transmit volume
(window size) in an exponential way (1,2,4,8..).

There
are two reasons for this mechanism

1. In a
congested network the slow start avoids additional congestion contribution by
building the transmitted load gradually.

2. TCP
utilizes an adaptive timer that builds its value based on previous round trip
delay measurements. Starting slow enables the TCP to train its timer while the
impact of wrong timing consideration is minimized by sending small amount of
data.

3.
Avoiding of packet loss in congested rowter.

PROBLEM

Traditional
TCP based applications use one or few TCP sessions. For example FTP uses two
ses-

HTTP
TCP Midleware IP

sions.
With the new HTTP protocol, every object transmission from a WEB site is
involved in one TCP session. Therefore, one HTTP session could easily (with the
new fancy WEB sites) end up with more than 10 TCP sessions. In this case the
slow start overhead is very high. The overhead is an important factor
especially in premium media such as wireless networks.

PRIOR
ART

.
RFC2001

. FTP
software does not perform slow start.

They
wait for the first TCP ACK and use the measurement for setting up initially
timer value. After that the entire window is sent. This concept works well in
lightly loaded systems with a constant round trip delay. However, in the iDEN
example this scheme will not work properly. The delay variation dne to the
dynamic PCH allocation will cause TCP time outs which will dramatically reduce
the throughput.